fix: istio sidecar injection from annotations to labels

[madmecodes]

What this PR does / why we need it:

This PR fixes the Istio sidecar injection configuration by moving from using annotations to using labels in Katib components.

Related Comment: kubeflow/katib#2527 (comment)
Issue: kubeflow/manifests#2798
Part of PR: kubeflow/manifests#3044

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[juliusvonkohout]

/retest

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